1993 DW home. Manufacturer's Serial Numbers are DSDAL4421A and DSDAL4421B. My question is simply, WHO BUILT THIS HOME? As I understand it, the DSD identifies the manufacturer or plant, and the AL identifies the state ... in this case, Alabama. However the 2017 list of licensed manufacturered home manufacturers does not list a name I can, with certainty, identify as DSD. Can anyone help?